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When Facebook goes public later this week, it's expected to be the tech world's biggest and highest-dollar ...

When Facebook goes public later this week, it's expected to be the tech world's biggest and highest-dollar debut ever. But a splashy entrance into the stock market doesn't always guarantee future financial success. CNET's Kara Tsuboi takes a look back at other tech giants, their IPOs, and how they're faring now.